Why would he add my friend?

So there is this guy I'm sorta friends with benefits with... and he doesn't know any of my other friends. One day I saw in a story from one of my BFF's that a 5-year-old went missing and sent it to everyone without realizing he couldn't see the contents. then goes on to ask who is this and I said he is my childhood friend. then he proceeds to tell me he request to follow my BFF on Snapchat. Why though?
Why would he add my friend?
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